Air nozzle



April 18,1944. F. H. CHIRGWIN 2,347,149

AIR NOZZLE Original Filed April 3, 1940 Patented Apr. 18, .1944

AIR NOZZLE Frederick H. Chirgwin, Los Angeles, Calif., assignor to B. F.Sturtevant Company, Boston, Mass.

Original application April 3, 1940, Serial No.

327,695. Divided and this application Novemher 8, 1941, Serial No.418,430

2 Claims.

This invention relates to air nozzles and relates more particularly toair distributing nozzles and to methods of forming same,

This application is a division of my copending application, Serial No.327,695, filed April 3, 1940.

In many air conditioned spaces, such for example, as in citrus plantsand in textile mills, it

is the practice to project chilled air through ejector nozzles in theupper portion of the space, the movement of primary air through theejectors inducing the flow of secondary air as recirculated air thusproviding effective circulation as well as distribution. The ejectornozzles are usually formed from galvanized sheet iron and the moisturein the air condenses upon their surfaces and drips down upon the floors.Such nozzles have been insulated by placing thick, conical shaped corknozzles over them but the expense has been great.

This invention provides a simple, relatively inexpensive air nozzlewhich avoids the objection of prior nozzles. In one embodiment of theinvention, a pattern of the nozzle is laid out upon an insulatingcomposition board of the type known as heat insulating wall board, asuitable one being formed from cellulose fibre such as bagasse. Thepattern corresponds, of course, to a developed, unrolled nozzle. Theboard is cut into blanks corresponding to the pattern; are slitted alongspaced converging lines; are then rolled in succession over one or moreconical templates; wire is wrapped around each, and then after removalfrom the template, each assembly is dipped into hot tar which not onlyfills the slits and covers the wire but adds a pleasing glossyappearance.

An object of the invention is to reduce the cost of insulated airnozzles.

The invention will now be described with reference to the drawing, ofwhich:

Fig. l is a plan view of an unrolled, slotted, nozzle blank formed froman insulating board;

Fig. 2 is an end view looking at the right hand end (facing the drawing)of Fig. 1;

Fig. 3 is a sectional view of one embodiment of a completed nozzleincorporating this invention, with section taken along the longitudinalcenter, and

Fig. 4. is a view showing a completed nozzle embodying this invention,connected to a supply duct.

The nozzle to be formed is a conical one, and

the developed pattern is laid out upon a cellulose insulating board,following which the blank 5 conforming to the pattern and shown by Figs.1 and 2, is cut out. The equally spaced slits 6 are cut along linesconverging to the apex of the cone which would be formed by extension ofthe lines, to a depth about three-fourths of the way through the board.The blank is then rolled up, preferably on a conical template having thecorrect proportions, and the wire I, shown in section by Fig. 3, iswound spirally around its exterior. The template is then removed fromthe nozzle and the collar 8 is then attached by the screws 9, in theinlet end of the nozzle. The assembly is then dipped into melted tarwhich forms the coating l0.

Fig. 4 illustrates how the nozzle is mounted to the supply duct I I bybeading the end of the collar 8 at I2.

The tar l6 forms a smooth, glossy covering for the nozzle, causing it toappear as well as prior more expensive nozzles, and at the same timefills the slits 6, covers the wires 1 and binds the assembly together.While tar has been found satisfactory, other thermoplastic materials maybe used.

While one embodiment of the invention has been described for the purposeof illustration, it should be understood that the invention is notlimited to the exact methods and apparatus described as modificationsthereof may be suggested by those skilled in the art without departurefrom the essence of the invention.

What is claimed is:

1. An air nozzle comprising a conical shaped member of non-metallic,rigid, heat insulating material, a substantially cylindrical sheet metalmember attached at one end to said conical member adjacent the large endthereof, and a binder layer of thermoplastic material on the inner andouter surfaces of said conical member.

2. An air nozzle comprising a conical shaped member of non-metallic,rigid, heat insulating material, a substantially cylindrical sheet metalmember attached at one end to said conical member adjacent the large endthereof, and a binder layer of thermoplastic material on the inner andouter surfaces of said conical member and on the inner and outersurfaces of a portion of said cylindrical member at said end of saidcylindrical member.

FREDERICK H. CHIRGWIN.

